package main

import "fmt"

func main() {
	s1 := "big"
	//s1[0]='c'
	byteStr := []byte(s1)
	byteStr[0] = 'c'
	fmt.Println(string(byteStr))
	s2 := "小明good human"
	runeStr := []rune(s2)
	runeStr[1] = '芳'
	fmt.Println(string(runeStr))
}
